Clean up CompilerTestUtilities2 - remove non-portable and unused code

[PortablePDB] Implement GetOffset, GetRanges, FindClosestLine

Remove test workaround for a fixed DiaSymReader bug 1068894

Produce an error when __makeref is used and TypedReference type is no…

Ensures that history always contains what user has typed

Remove SCC bindings

Canonicalize all interactive window commands

We no longer use SCC bindings in our project yet the definitions remained around and caused a dialog prompt on solution open.  Removing these as they are no longer needed

Initial work to add telemetry to Interactive Windows

- add telemetry for create/open/close Interactive Windows.

Refactor MetadataFileReferenceResolver classes

 1. Allow button names to have different casing than command names (which
should be PascalCase).
 2. Sidestep some name conflicts with other VS packages.

Switch Section honors NewLineForBracesInControlBlock option

Report a better exception when compiler test resource is not found

The cross platform legs are causing roughly ~10% of all our Jenkins jobs to fail
(3% Mac failure, 7% Linux failure).  The main source of the instability is the
NuGet and build step.  As a short term work around I'm adding retry logic to
those steps to get the false failure rate down.

Update the metadata reader to 1.1.0-alpha-00009

fixes #3539

Fix some analyzer load diagnostics IDs and a duplicate roslyn diagnostic ID

Fixes #3805 and #2990

Ensure that syntax tree actions are also re-executed by the solution crawler when compilation options (or analyzer rule severity) are changed.

Fixes #3796 

They're expensive and end up consuming lots of resources.

Fix mapping from line numbers to prompt spans

Fixes #3805 and #2990

Fixed the order of optimizing argument reordering temps and packaging…

Bonus: Tighten projection span list asserts.

Conflicts:
	src/Workspaces/Core/Desktop/Workspace/MSBuild/MSBuildWorkspace.cs

Ensure that syntax tree actions are also re-executed by the solution crawler when compilation options (or analyzer rule severities) are changed.

Fixes #3796

Modifications to bootstrap Roslyn on CoreClr without exceptions

Open source build improvements

Report diagnostics for exceptions within the analyzer driver.